[htdig] Can I use ht://dig on any web server?

[Sid McQuilter]

dear  htdig, I would like to use ht://dig on my website. my ISP in UNIX based ( I think ). Can I use ht://dig on any server? Is the software easy to set-up?. do I have to pay for the software? If the answers to the above are No, No, Yes, can you recommend a search facility that is easy to set up and does not include advertisements as part of the package?   I hope that you can help me with this,   thank you in advance   Sid McQuilter   [EMAIL PROTECTED]