Even being invited, I would carefully read the terms and conditions around your invite. I’m sure most Lock Screen screenshots wouldn’t amount to much as Apple has specifically shared some information with the public therefore it falls outside of “Confidential Information”. Some of the other functionality of the betas was never discussed or released however.
5. Definition of Confidential Information. You agree that the Pre-Release Software and any information concerning the Pre-Release Software (including its nature and existence, features, functionality, and screen shots), the Seeding Tools, and any other information disclosed by Apple to you in connection with the Beta Program will be considered and referred to in this Agreement as “Confidential Information.” Information that otherwise would be deemed Confidential Information but (a) is generally and legitimately available to the public through no fault or breach of yours, (b) is generally made available to the public by Apple, (c) is independently developed by you without the use of any Confidential Information, (d) was rightfully obtained from a third party who had the right to transfer or disclose it to you without limitation, or (e) any third party software and/or documentation provided to you by Apple and accompanied by licensing terms that do not impose confidentiality obligations on the use or disclosure of such software and/or documentation will not be considered Confidential Information under this Agreement. All Confidential Information remains the sole property of Apple and you have no implied licenses or other rights in the Confidential Information not specified in this Agreement.
Section 6 sets out your obligations regarding disclosure and Apple’s remedies in case of a breach.
6. Nonuse and Nondisclosure of Confidential Information. Except as expressly permitted in this Section 6, you agree that you will not disclose, publish, or otherwise disseminate any Confidential Information to anyone other than individuals who are enrolled in the same individual seed as you, or as otherwise expressly permitted or agreed to in writing by Apple. You further agree to take reasonable precautions to prevent any unauthorized use, disclosure, publication, or dissemination of Confidential Information, including preventing access to or display of the Apple Software to third parties. You agree to use the Confidential Information solely for the permitted uses as set forth in this Agreement. You agree not to use Confidential Information otherwise for your own or any third party’s benefit without the prior written approval of an authorized representative of Apple in each instance. You hereby acknowledge that unauthorized disclosure or use of Confidential Information could cause irreparable harm and significant injury to Apple that may be difficult to ascertain. Accordingly, you agree that Apple will have the right to seek immediate injunctive relief to enforce obligations under this Agreement in addition to any other rights and remedies it may have.