.SE is the TLD for Sweden.
Registration details can be found in the TLD reference chart.
There are no local presence requirements for this TLD, but the following contact requirements apply:
Swedish Individuals must submit ID card number. The personal identity number consists of 10 digits and a hyphen. The first six correspond to the person's birthday, in YYMMDD form. They are followed by a hyphen. The seventh through ninth are a serial number.
Swedish Organizations must submit their Swedish business registration number.
Organizations based outside of Sweden must also submit VAT-ID. VAT syntax can be checked here.