ReFox is good, and you can 'brand' your app with a 'password' so that supposedly you can't decompile without the password. However, it's still possible to decompile the thing - despite what they say. It's a bit of a pain, but non-the-less it's still possible. There is another one called FoXafe that also makes changes to the runtime files similar to what ReFox does, but unlike ReFox it's not a de-compiler - so it might be a better way to protect the source code - and it' like 10 bucks - a tad cheaper than ReFox. It is also possible to use both at the same time, which is probably your best bet.
FoXafe is at: http://foxafe.freeservers.com/
ReFox is at: http://www.xitech-europe.co.uk/Products/ReFox/index.htm

>>I have seen some software on the net that will uncompile and decrypt applications in VFP. I was wondering is there a truly safe way to distribute applications and protect source code.
>>Thanks for any help.
>
>REFOX is, apparently, a safe encryption system for VFP. I've not used it but it is going to go into the commercial application I'm working on here.