First of all, even in Canada I think they spell it "license"! [img]/ubbthreads/images/graemlins/grin.gif[/img]
You are right in wanting to make it simple, but you need to protect yourself as well. The thing is, be as specific as you can in what rights you are licensing the images for, and limit it as much as possible.
Here's an example of language I recently used for a magzine layout on Cindy Margolis:
License granted for use of assorted images of Cindy Margolis in glamour studio setting. For use in one issue of Glacier Magazine only, and related promotion and web use in connection with story about Cindy Margolis.
In this case, note that I defined WHICH images, and specificed that they ONLY be run in ONE issue of the magazine, and DID give them permission to use the photos to promote the issue, which thereby eliminates them from being re-purposed into an unrelated ad or magazine topic. And all in two sentences.
Here's an example of licensing images for a calendar. This is one of those promotional calendars you see hanging in a machine shop or such:
Stock Photo License - One-time advertising specialty calendar rights, only for Swimsuits 2007 Calendar - images TBD. Terms per Purchase Agreement
This is a long-time client and they have their own language in a Purchase Agreement (not specific to licensing or this product) that goes with every license. I use "TBD" here because they're sending me an advance before they select the images. Once they've made their selections, I'll replace the "TBD" with my 4-digit set numbers. Again, notice the word "one-time" - they're not buying them forever, only for this one year 2007 calendar. Also, since I use the word "Stock" it is clear to all that this is not an assignment, and the images will continue to belong to the photographer. (There is a seperate Delivery Memo that accompanied the submission of the film, which clarifies when the film must be returned by).
Now, these licenses are part of my invoice, where I specifiy the fee as well. I also have boilerplate language on the bottom of every invoice that says:
Reproduction rights are transferred only upon photographer's receipt of full payment of this invoice and subject to all terms and conditions on reverse side. Only rights described above are authorized.
As noted, I have extensive legalize on the back on my invoices, which I got courtesy of the Advertising Photographers of America
standard forms file. I'm sure similar language can be obtained from photography books, or you can join APA or its Canadian counterpart to access the info (some of the info is different for Canadians). You could also visit some of these websites to possibly find more examples, and (under the Trade Groups section, find links to Canadia trade groups): http://www.editorialphoto.com/resources/
Hope this helps, let me know if you need more.
Andy Pearlman Studio