i wouldn't mind, as long as its being downloaded and most of the time when people have a problem they'll have to cometo you anyways.
however it is just common netiquette to let a person or company know when you link files ... but as Martyn said, can just lock the files for direct access only

i've seen alot of users do it with plain html, but i'm still unsure how
you also gotta note though, you don't speak Tai - and they might not speak english ... might cause a problem language wise for asking permission. They should atleast be crediting you which they kinda do, and the descriptions are pretty good for them
Anata aru kowagaru no watashi! 