If it's not against the EULA for the software in question, which it looks to have been in the case of the Kapersky 2012 demo. They granted you an evaluation license when you downloaded it, but it did -not- give you redistribution rights for the demo either.
Edit: Same for Nod32 it looks like, I just did some digging and their EULA doesn't indicate the trial having redistribution rights either. Here's their bit direct from their website:
Software is provided exclusively to end-users for the usage. This usage is in accordance with the License Agreement. ESET, spol. s r. o. and/or its respective suppliers expressly prohibit any Software reproduction and/or spreading that is not in accordance with License Agreement. Such action is expressly prohibited by law
As the License Agreement for nod32's trial doesn't grant redistribution rights, and it's provided to you for usage, NOT redistribution, the action would be prohibited by law.