price_security/security/security.xml

<?xml version="1.0"?>
<openerp>
    <data noupdate="1">

    <record model="res.groups" id="group_restrict_prices">
        <field name="name">Restrict Prices</field>
    </record>

    <record id="restrict_price_read_only_payment_term" model="ir.rule">
        <field name="name">Restrict Price Read Only on Payment Term</field>
        <field name="model_id" ref="account.model_account_payment_term" />
        <field name="domain_force">[('name', '=', False)]</field>
        <field name="groups" eval="[(4, ref('price_security.group_restrict_prices'))]"/>
        <field name="perm_read" eval="False"/>
    </record>

    <record id="restrict_price_read_only_pricelist" model="ir.rule">
        <field name="name">Restrict Price Read Only on Pricelist</field>
        <field name="model_id" ref="product.model_product_pricelist" />
        <field name="domain_force">[('name', '=', False)]</field>
        <field name="groups" eval="[(4, ref('price_security.group_restrict_prices'))]"/>
        <field name="perm_read" eval="False"/>
    </record>

    </data>
</openerp>