Currently you're telling me what won't happen in a very unfortunate event. I think this is wrong in 2 ways.
1. You're telling me a message "the other way around". Even if you just say "Keep your documents secure" is better than "Nobody will access your documents".
2. You're comparing w/ Google docs so, following the logic of your message, what's the probability that Google will get hacked? Tiny, right? So... you're not telling me anything useful.
You can check lastpass or 1password as examples. They implement more or less the same thing, but as you can see they don't talk about how it works, but about the benefit for me, as a customer.
It did have a positive influence on me right away. It also established this sense of trust. Enough that I began to crawl through the other pages for more info.
I also appreciated how you managed to convey, in a single image, exactly what was encrypted (ie, both document content and filename).
The first question I had was how Google Docs handled this. Do they also encrypt? If so, do they encrypt both filename and content? Considering Google's business model, I always assumed that they did less in this regard - relying instead on other mechanisms to protect user data.
I would keep the encryption message and double-down... comparing how other services handle privacy, tracking, data-mining, encryption. It's your strongest selling point.
But as a technical user I despise that and I liked the honest way this was presented. Because this is something everyone should be thinking before signing up (granted most don't, so, yeah).
All suggestions in this thread ("it is secure!") are just marketing gibberish, slogans without any meaning. If you intend to appeal to a large, stupid audience, maybe they're good, but it is a little dishonest.
While what he has is fine, you can convey the same sentiment without saying "Even if we get hacked..."
I definitely get what you are trying to do though. It's so secure it doesn't matter if someone has the data.
Perhaps some clever illustration depicting the odds of cracking AES-256 (e.g. a man fishing in the ocean but there's only one fish to be caught). Visuals can be a great way to convey complex concepts.
I don't think what you have is a huge red flag but someone might read it and say "Whoa, ok, it sounds secure but what about other systems they have in place? Are they insecure, are people trying to get at my data 24/7 on their servers, etc.