Terms of service

Chapter 1. General provisions

Article 1. Purpose

These Terms set out the conditions and procedures for using the Puzzlog service provided by zerobacklabs (the “Company”), and the rights, obligations, and responsibilities of the Company and users.

Article 2. Definitions

① “Service” means all Puzzlog features provided by the Company through its mobile application and related web pages.

② “Member” means a person who agrees to these Terms, creates an account, and uses the Service. Because the Service is provided to members, “user” and “member” have the same meaning in these Terms.

③ “User Content” means photos, videos, display names, and other information that members register, transmit, or store in the Service.

④ “Group” means a gathering within the Service that a member forms by inviting other members so that they can view one another’s content.

Article 3. Publication and amendment of the Terms

① The Company posts these Terms and necessary information, including its name, the name of its representative or operator, and its contact email address, on the registration screen, service information website, app settings, or similar locations so members can easily review them.

② The Company may amend these Terms within the limits of applicable law.

③ When amending these Terms, the Company states the effective date and reasons and posts the amendment in app notices or on the service information website for the following periods:

1. Changes that are material or unfavorable to members: from 30 days before the effective date until that date.
2. Other changes: from 7 days before the effective date until that date.

④ For material or unfavorable changes, the Company also informs members of the changes and obtains their agreement where necessary.

⑤ For other changes, the amended Terms may apply if the Company clearly explains, when announcing them, that failure to object by the effective date will be treated as agreement, and the member does not object.

⑥ If a member does not agree to the amended Terms, the previous Terms generally continue to apply. However, where there is a legitimate reason why continued application is difficult, such as a change to the Service, either party may terminate the service agreement. The Company will not charge the member a penalty for that reason.

Chapter 2. Service agreement and accounts

Article 4. Formation of the service agreement

① The service agreement is formed when a user agrees to these Terms, applies to register using a Google, Apple, or other supported account, and the Company accepts the application and completes account creation.

② The Company may refuse or defer acceptance in any of the following cases:

1. The user provides false information or uses another person’s information.
2. The user does not meet the eligibility requirements in Article 5.
3. The user previously had a service agreement terminated for a serious breach of these Terms.
4. Service facilities or technical circumstances make provision difficult.
5. The application otherwise violates applicable law or presents a significant risk of disrupting normal operation.

Article 5. Eligibility and age

① Only persons aged 14 or older may use the Service.

② The Company does not accept registration by children under 14. If it discovers such a registration, it terminates the account and handles personal information in accordance with applicable law and the Privacy Policy.

③ Where a legal representative’s consent is required for a minor’s use, applicable law governs.

Article 6. Account management

① Members sign in using supported external accounts such as Google or Apple. The Company does not store passwords for those external accounts.

② Members must appropriately manage their sign-in provider accounts and Service accounts and must not allow unauthorized use by third parties.

③ Members who learn of account theft or unauthorized use must immediately notify the Company and follow its instructions.

④ The Company is not responsible for damage caused by a member’s attributable failure to manage their account, except where the Company’s intent or negligence contributed to the damage.

Article 7. Notices to members

① The Company may notify individual members through in-app notifications, information screens displayed when the app opens, or email addresses provided by members.

② Notices to all members may replace individual notices by being posted in app notices or on the service information website for at least 7 days.

③ Matters that materially affect a member’s service agreement, rights, or obligations will nevertheless be individually communicated by reasonably available means.

Chapter 3. Use of the Service

Article 8. Provision, changes, and suspension of the Service

① The Company endeavors to provide the Service 24 hours a day, year-round. Specific features and instructions are provided in the app or service information screens.

② The Company may temporarily suspend all or part of the Service for maintenance, inspection, replacement or failure of communications facilities, communications outages, security needs, or other substantial operational reasons.

③ For planned suspensions, the Company announces the reason and duration in advance. It may notify members afterward where advance notice is difficult, such as an urgent outage or security issue.

④ The Company may change all or part of the Service for reasonable grounds, including improvements, maintenance, security, technical or operational needs, or changes to laws or policies. Changes that materially affect members’ use are announced in advance.

⑤ If the Company discontinues the entire Service, it notifies members at least 30 days before termination unless special circumstances exist.

Article 9. Protection of personal information

① The Company protects members’ personal information in accordance with applicable law.

② The Privacy Policy specifies processing purposes and categories, retention periods, destruction procedures, outsourcing and overseas transfers, and data subjects’ rights and how to exercise them.

Chapter 4. Content and user obligations

Article 10. Rights to User Content

① Copyright and other rights to User Content belong to the member or the rightful owner.

② Members must have the rights necessary to use the content they register or share in the Service, and must not infringe others’ copyrights, portrait rights, personal information, privacy, or other rights.

③ Members grant the Company a non-exclusive license, to the extent necessary to provide the Service, to store, reproduce, transmit, and display User Content, create previews and thumbnails for the Service, and display content to members of groups selected by the member.

④ This license ends when the member deletes the content or the service agreement finally ends, except to the extent needed to restore the account during the deletion grace period in Article 14 or to satisfy a legal retention obligation.

⑤ The Company is not obligated to continuously monitor or review User Content. It may take necessary measures when it identifies content that violates these Terms or applicable law, or receives a rights-infringement report.

Article 11. Rights to Company content

① Copyright and intellectual property rights in designs, programs, images, text, and other content created or owned by the Company belong to the Company or the rightful owner.

② The Company grants members a limited, non-exclusive right to use the Service for personal, non-commercial purposes under these Terms.

③ Except as permitted by applicable law, members may not reproduce, distribute, transmit, or commercially use content owned by the Company without its prior consent.

Article 12. Prohibited conduct

① Members must not engage in the following conduct when using the Service:

1. Registering false information or misappropriating another person’s information during registration or information updates.
2. Using another member’s account, personal information, or content without authorization.
3. Infringing the copyrights, portrait rights, personal information, privacy, or other rights of the Company or a third party.
4. Harassing or threatening other members, defaming others, or invading their privacy.
5. Posting or transmitting unlawful or obscene information or other content that violates applicable law.
6. Interfering with the security or normal operation of the Service or related systems.
7. Using automated programs, bots, crawlers, or similar tools that impose excessive load without the Company’s permission.
8. Reverse engineering the Service or improperly extracting source code, except as permitted by applicable law.
9. Posting or transmitting commercial advertising without the Company’s prior consent.
10. Otherwise violating applicable law or these Terms.

② The Company may take necessary measures under Articles 13 and 15 for violations of paragraph ①.

Article 13. Reporting and addressing rights infringements

① A person who claims that information shared or provided through the Service infringes their privacy, reputation, or other rights may substantiate the infringement and request deletion, access restrictions, or other necessary measures.

② Requests may be sent to [email protected]. When the Company takes necessary measures under applicable law, it informs the requester and the member who posted the information of the result.

③ Where determining infringement is difficult or a dispute between interested parties is anticipated, the Company may temporarily block access for up to 30 days in accordance with applicable law.

④ The Company may delete or restrict access to content that clearly violates applicable law or Article 12 without prior notice. Unless special circumstances exist, it promptly informs the member of the action and reasons afterward.

Chapter 5. Termination and liability

Article 14. Membership withdrawal and account deletion

① Members may request membership withdrawal in the app at any time.

② Upon receipt of a request, use of the Service is immediately suspended. The Company ends sign-in sessions, stops notifications, and prevents the member’s group-shared content from being displayed to other members.

③ To address accidental or mistaken deletion, the Company retains the account and User Content in a recoverable state for 30 days from the request. Personal information is used only for account recovery during this period.

④ During this grace period, a member may cancel the request by signing in again with the same account or using another method provided by the Company. The account and usage records are then restored.

⑤ If a member explicitly requests immediate deletion of their personal information during the grace period, the Company verifies identity as necessary and promptly destroys the information, except information that must be retained under other laws. Withdrawal becomes final immediately, and the account and content cannot be recovered.

⑥ If the member does not cancel the request within 30 days, withdrawal and termination become final. The Company promptly destroys personal information except information that must be retained under other laws.

⑦ Information that must be retained for a specified period under other laws is stored separately from other personal information and destroyed when that period ends.

Article 15. Restrictions and termination

① The Company may delete content or temporarily restrict all or part of a member’s use in any of these cases:

1. Significantly disrupting operation, including interfering with other members’ use or misappropriating information.
2. Engaging in conduct prohibited by Article 12.
3. Violating applicable law or seriously infringing others’ rights.

② The Company may terminate the agreement if the member repeats such conduct or fails to remedy it within a reasonable period set by the Company.

③ Before termination, the Company generally informs the member of the reasons and provides a reasonable opportunity to explain or remedy the conduct.

④ Where serious harm to other users or an urgent security risk is possible, or immediate action is required by law or a competent authority, the Company may restrict use or terminate first and promptly notify the member of the action and reasons afterward.

⑤ Members may challenge restrictions or termination through the contact in Article 17.

⑥ Personal information of members whose agreements have ended is handled under the Privacy Policy and applicable law.

Article 16. Damages and scope of liability

① If the Company or a member intentionally or negligently breaches these Terms and causes damage to the other party, the responsible party compensates for that damage in accordance with applicable law.

② The Company is not liable for damage arising from force majeure such as natural disasters, causes attributable to a member, or third-party communications, network, or software failures for which the Company has no intent or negligence.

③ The Company does not guarantee the accuracy, legality, or reliability of content registered or shared by members.

④ The Company is generally not a party to disputes between members or between a member and a third party. It nevertheless takes necessary measures where required by law or upon a report under Article 13.

⑤ Nothing in this Article limits or excludes liability arising from the Company’s intent or gross negligence, or liability that cannot be limited or excluded under applicable law.

Article 17. Inquiries and dispute resolution

① Members may send comments, complaints, rights-infringement reports, objections to restrictions, or immediate deletion requests under Article 14, paragraph ⑤, to [email protected].

② The Company and members endeavor to resolve disputes concerning use of the Service amicably.

③ If discussion does not resolve a dispute, either party may seek mediation from the Content Dispute Resolution Committee, Consumer Dispute Settlement Commission, Personal Information Dispute Mediation Committee, or another relevant body under applicable law.

Article 18. Governing law and jurisdiction

① The laws of the Republic of Korea govern these Terms and the relationship between the Company and members. Matters not specified here are governed by applicable law.

② Lawsuits arising between the Company and a member in connection with the Service are subject to the jurisdiction of the court for the member’s address at the time of filing, or, if there is no address, the member’s place of residence.

③ If the member’s address or residence is unclear at filing, or the member resides abroad, proceedings may be brought in a court determined under applicable law, including the Civil Procedure Act.

Supplementary provisions

① These Terms take effect on September 28, 2026.

② Any previous Terms of Service are replaced by these Terms on their effective date.