New details about a way Oracle envisions managing TikTok user data and rewriting the app, and how TikTok’s technology actually operates, underscore how hard it could be for Oracle to separate the app from its Chinese owner.

At the same time, Oracle has held preliminary discussions with the U.K. government about protecting TikTok’s user data in that country, similar to its plan in the U.S., said a person familiar with the talks, which haven’t been previously reported. Those talks have happened despite the fact that Oracle and TikTok’s parent company ByteDance, which is based in China, are waiting for final approval from the Trump Administration over a partnership to resolve alleged national security concerns related to the social media app.