(a) Recognizing the difference between school libraries, school computer labs, and school media centers, which serve unique educational purposes, and public libraries, which are designed for public inquiry, all computers at a school site with access to the Internet available for student use must be equipped to restrict, including by use of available software filtering technology or other effective methods, all student access to material that is reasonably believed to be obscene or child pornography or material harmful to minors under federal or state law. (b) A school site is not required to purchase filtering technology if the school site would incur more than incidental expense in making the purchase. (c) A school district receiving technology revenue under section 125B.26 must prohibit, including through use of available software filtering technology or other effective methods, adult access to material that under federal or state law is reasonably believed to be obscene or child pornography. (d) A school district, its agents or employees, are immune from liability for failure to comply with this section if they have made a good faith effort to comply with the requirements of this section. (e) “School site” means an education site as defined in section 123B.04, subdivision 1, or charter school under section 124D.10.